@book {R{\"u}ther 1936,
	title = {Der heilige Bruno von K{\"o}ln, der Kart{\"a}user},
	series = {Lebensschule der Gottesfreunde},
	number = {22},
	year = {1936},
	pages = {48},
	address = {Meitingen},
	keywords = {biographiae, Bruno Cartusiensis (biographia)},
	author = {R{\"u}ther, Josef}
}
